WHEEL CONTROL STRUCTURE FOR A FOLDING IMPLEMENT

摘要

A multi-section implement frame includes outer wing sections which fold relative to inner wing sections and then over a main center frame to a transport positio n. The wing sections include selectively extendable and retractable structure such as li ft wheel assemblies which, if extended in the transport position, can interfere with each other. Transducers detect the position of the inner wing sections during folding an d unfolding and provide signals to an implement control unit (ICU) to automatically operate the lift wheel assemblies to prevent interference during folding and unfolding and to assur e the lift wheels are extended before the implement frame reaches the fully unfolded position. Proximity switches supported above the center frame or other transducer devices such a s mercury switches on the wing sections responsive to section angle provide the signal s to the ICU. During folding, the ICU causes the lift structure to retract after both switches are activated. During unfolding, the lift structure is extended only after there is no long er potential interference between components. Extension of the lift assemblies during unfolding is controlled by the ICU so that the frame is generally level in the fully unfolded position. The outer wing sections can be folded to narrow the machine whenthe ground is difficult to penetrate or when a narrow working width is required while still retaining implement operation under the control of the ICU.